Large-scale preparation of hierarchical manganese oxide octahedral molecular sieves (OMS-1) composed of nanoplate microspheres via a facile one-pot reflux method

2011 ◽  
Vol 21 (46) ◽  
pp. 18527 ◽  
Author(s):  
Hao-Jie Cui ◽  
Jian-Wen Shi ◽  
Fan Liu ◽  
Ming-Lai Fu
Keyword(s):  
Manganese Oxide ◽  
Molecular Sieves ◽  
Large Scale ◽  
One Pot ◽  
Large Scale Preparation ◽  
Octahedral Molecular Sieves ◽  
Scale Preparation

The acidic ionic liquid [BSO3HMIm]HSO4: a novel and efficient catalyst for one-pot, three-component syntheses of substituted pyrroles

2015 ◽  
Vol 70 (1) ◽  
pp. 29-38 ◽  
Author(s):  
Yuan Luo ◽  
Bao-Qiang Zhang ◽  
Yan-Hong He ◽  
Zhi Guan
Keyword(s):  
Ionic Liquid ◽  
Reaction Time ◽  
Large Scale ◽  
Environmentally Friendly ◽  
One Pot ◽  
Efficient Catalyst ◽  
Pyrrole Derivatives ◽  
Acidic Ionic Liquid ◽  
Large Scale Preparation ◽  
Scale Preparation

AbstractAn acidic ionic liquid 3-methyl-2-(1-sulfobutyl)-1H-imidazolium hydrogensulfate, [BSO3HMIm]HSO4, was used as an efficient catalyst for the synthesis of a variety of pyrrole derivatives via a one-pot, three-component condensation of amines, nitroolefins, and 1,3-dicarbonyl compounds. Good to excellent yields of 72–96% were obtained under reflux in ethanol. The catalyst could easily be recovered and recycled up to six times, resulting in good yields without prolonging the reaction time. This method was also efficient in large-scale preparation. The procedure could be easily expanded to a one-pot, four-component reaction. This ionic liquid-catalyzed reaction provided an environmentally friendly alternative to the synthesis of pyrrole derivatives.

scholarly journals An Efficient Synthesis of Ginsenoside Rg5 via Conversion of PPD Type Saponins: Unusual Application of 4A Molecular Sieves

2021 ◽  
Vol 16 (4) ◽  
pp. 1934578X2110076
Author(s):  
Cheng Le-qin ◽  
Ye An-qi ◽  
Zhang Hao-ran ◽  
Zhang Yue-wei ◽  
Li Ling
Keyword(s):  
Hydrochloric Acid ◽  
Molecular Sieves ◽  
Molecular Sieve ◽  
Large Scale ◽  
High Yield ◽  
Experimental Conditions ◽  
Large Scale Preparation ◽  
Reaction Solution ◽  
Ginsenoside Rg5 ◽  
Scale Preparation

Ginsenoside Rg5 is a rare secondary ginsenoside with good pharmacological activity. However, preparation of Rg5 is time consuming, gives a low yield and has poor selectivity and efficiency. Therefore, the current study describes an efficient method of preparing ginsenoside Rg5 through conversion of Protopanaxadiol (PPD) type saponins in the presence of a molecular sieve and hydrochloric acid. The PPD type saponins were transformed on the surface of a molecular sieve to obtain ginsenoside Rg5 and most of the generated secondary ginsenoside was dissociates into the reaction solution, avoiding further decomposition. In addition, the optimal experimental conditions were identified to be as follows; 0.5 ml of absolute ethanol, 0.2 mol/L of hydrochloric acid, 12.5 mg of a 4A molecular sieve, a reaction time of 2.5 hours and a reaction temperature of 70 ℃. Under these experimental conditions, yields of upto 63.2% were obtained for ginsenoside Rg5. Moreover, the hydrochloric acid-catalyzed preparation of ginsenoside Rg5 effectively inhibited its decomposition in the presence of a molecular sieve. The method is therefore suitable for laboratory and industrial production with the advantages of large-scale preparation and high-yield.

Facile large-scale synthesis of Au–Pt alloyed nanowire networks as efficient electrocatalysts for methanol oxidation and oxygen reduction reactions

RSC Advances ◽  
2015 ◽  
Vol 5 (106) ◽  
pp. 87061-87068 ◽  
Author(s):  
Pei Song ◽  
Shan-Shan Li ◽  
Li-Li He ◽  
Jiu-Ju Feng ◽  
Liang Wu ◽  
...  
Keyword(s):  
Large Scale ◽  
Chemical Method ◽  
Wet Chemical Method ◽  
One Pot ◽  
Structure Directing Agent ◽  
Oxygen Reduction Reactions ◽  
Large Scale Preparation ◽  
Scale Preparation ◽  
Wet Chemical ◽  
Nanowire Networks

A rapid one-pot wet-chemical method was developed for large-scale preparation of surface-clean AuPt alloyed nanowire networks with the assistance of N-methylimidazole as a structure-directing agent and a weak stabilizing agent.

Large scale preparation of silver nanowires with different diameters by a one-pot method and their application in transparent conducting films

RSC Advances ◽  
2016 ◽  
Vol 6 (10) ◽  
pp. 8096-8102 ◽  
Author(s):  
Hongwei Ding ◽  
Yujuan Zhang ◽  
Guangbin Yang ◽  
Shengmao Zhang ◽  
Laigui Yu ◽  
...  
Keyword(s):  
Large Scale ◽  
Silver Nanowires ◽  
Polyol Method ◽  
One Pot ◽  
Transparent Conducting Films ◽  
Transparent Conducting ◽  
Large Scale Preparation ◽  
Scale Preparation ◽  
Different Diameters

Silver nanowires (AgNWs) with varied diameters were synthesized by a facile and efficient one-pot polyol method. Each run of the reaction with this method can provide more than 10 g of AgNWs.

A novel one-pot route for large-scale preparation of highly photoluminescent carbon quantum dots powders

Nanoscale ◽  
2013 ◽  
Vol 5 (20) ◽  
pp. 9558 ◽  
Author(s):  
Juan Hou ◽  
Jin Yan ◽  
Qi Zhao ◽  
Yi Li ◽  
Hong Ding ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Large Scale ◽  
Carbon Quantum Dots ◽  
One Pot ◽  
Large Scale Preparation ◽  
Scale Preparation

Purification of the Antihemophilic Factor by Gel Filtration on Agarose

1969 ◽  
Vol 22 (03) ◽  
pp. 577-583 ◽  
Author(s):  
M.M.P Paulssen ◽  
A.C.M.G.B Wouterlood ◽  
H.L.M.A Scheffers
Keyword(s):  
Factor Viii ◽  
Plasma Proteins ◽  
Large Scale ◽  
Gel Filtration ◽  
Large Scale Preparation ◽  
Scale Preparation ◽  
Antihemophilic Factor

SummaryFactor VIII can be isolated from plasma proteins, including fibrinogen by chromatography on agarose. The best results were obtained with Sepharose 6B. Large scale preparation is also possible when cryoprecipitate is separated by chromatography. In most fractions containing factor VIII a turbidity is observed which may be due to the presence of chylomicrons.The purified factor VIII was active in vivo as well as in vitro.

The occurrence of long chain polyprenols in leaves of plants of Rosaceae family and their isolation by time-extended liquid chromatography

1992 ◽  
Vol 70 (6) ◽  
pp. 448-454 ◽  
Author(s):  
Ewa Świeżewska ◽  
T. Chojnacki ◽  
W. J. Jankowski ◽  
K. Singh ◽  
J. Olsson
Keyword(s):  
Liquid Chromatography ◽  
Fatty Acid ◽  
Large Scale ◽  
Fatty Acid Esters ◽  
Large Scale Preparation ◽  
Scale Preparation ◽  
Wet Weight ◽  
Rosaceae Family ◽  
Acid Esters ◽  
Long Chain

The long chain polyprenols composed of 30 and more isoprene units from leaves of plants belonging to the genera Potentilla and Rosa have been described. They occur in the form of fatty acid esters. The composition of polyprenol mixture was species dependent and its content reached ca. 0.5% wet weight. Large scale preparation of individual polyprenols from a natural polyprenol mixture was performed using time-extended liquid chromatography on the hydrophobic gel Lipidex-5000.Key words: long chain polyprenols, Rosaceae.

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